Upgrade to xunit3 #2304

Job	Run time
create_nuget	4m 7s
validate_readme	44s
validate_test_projects	1m 51s
build_and_test_x64 (windows-2022, Debug)	5m 6s
build_and_test_x64 (windows-2022, Debug, /p:InvariantGlobalization=true)	6m 30s
build_and_test_x64 (windows-2022, Release)	6m 1s
build_and_test_x64 (windows-2022, Release, /p:InvariantGlobalization=true)	7m 18s
test_trimming (win-x64)	56s
test_trimming_wpf (win-x64)	1m 36s
build_and_test_x64 (ubuntu-22.04, Debug)	9m 21s
test_trimming_wpf (win-x86)	54s
build_and_test_windows_x86 (Debug)	7m 39s
test_trimming (win-x86)	57s
build_and_test_x64 (ubuntu-22.04, Debug, /p:InvariantGlobalization=true)	9m 59s
build_and_test_windows_x86 (Debug, /p:InvariantGlobalization=true)	7m 38s
test_trimming (linux-x64)	56s
build_and_test_x64 (ubuntu-22.04, Release)	9m 56s
test_trimming (osx-x64)	1m 4s
build_and_test_x64 (ubuntu-22.04, Release, /p:InvariantGlobalization=true)	9m 56s
build_and_test_windows_x86 (Release)	6m 53s
build_and_test_x64 (macos-14, Debug)	6m 51s
build_and_test_x64 (macos-14, Debug, /p:InvariantGlobalization=true)	6m 55s
build_and_test_windows_x86 (Release, /p:InvariantGlobalization=true)	7m 19s
build_and_test_x64 (macos-14, Release)	6m 33s
build_and_test_x64 (macos-14, Release, /p:InvariantGlobalization=true)	6m 33s
validate_nuget	2m 0s
merge_coverage	0s
deploy	0s
	2h 15m 33s

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